Fixed cursor flickering

Author: joaompneves

CefSharp.Wpf/ChromiumWebBrowser.cs

@@ -489,6 +489,7 @@ private void NoInliningConstructor()
             DragOver += OnDragOver;
             DragLeave += OnDragLeave;
             Drop += OnDrop;
+            GiveFeedback += OnGiveFeedback;
 
             IsVisibleChanged += OnIsVisibleChanged;
 
@@ -610,6 +611,7 @@ protected virtual void Dispose(bool isDisposing)
                     DragOver -= OnDragOver;
                     DragLeave -= OnDragLeave;
                     Drop -= OnDrop;
+                    GiveFeedback -= OnGiveFeedback;
 
                     IsVisibleChanged -= OnIsVisibleChanged;
 
@@ -788,7 +790,7 @@ void IRenderWebBrowser.UpdateDragCursor(DragOperationsMask operation)
         protected virtual void UpdateDragCursor(DragOperationsMask operation)
         {
             var dragCursor = DragCursorProvider.GetCursor(operation);
-            UiThreadRunSync(() => Mouse.SetCursor(dragCursor));
+            UiThreadRunAsync(() => Mouse.SetCursor(dragCursor));
         }
 
         /// <summary>
@@ -1532,6 +1534,16 @@ private void OnDragOver(object sender, DragEventArgs e)
             }
         }
 
+        /// <summary>
+        /// Handles the <see cref="E:GiveFeedback" /> event.
+        /// </summary>
+        /// <param name="sender">The sender.</param>
+        /// <param name="e">The <see cref="GiveFeedbackEventArgs"/> instance containing the event data.</param>
+        private void OnGiveFeedback(object sender, GiveFeedbackEventArgs e) {
+            /// prevent showing default cursor, the appropriate cursor will be set by <see cref=UpdateDragCursor />
+            e.Handled = true;
+        }
+
         /// <summary>
         /// Handles the <see cref="E:DragEnter" /> event.
         /// </summary>